Weird DNS Server Switch
Apr 26, 2008
I recently switched my site tdnforums.com over to a new server about a week ago. Some folks are still complaining that they are viewing the forums on the OLD SERVER. Perhaps DNS is taking a long time to switch over but get this... for many people tdnforums.com is switching BACK and FORTH between the old server and the new server. So, on some visits it'll resolve to the new server... on other page refreshes you'll be viewing the forums on the old server. What the heck? This has actually happened to me a few times myself so I know that they aren't crazy.
Why is DNS doing this? Sometimes the site resolves on the old server and then the new?
What's going on here? Why isn't it flipping over 100%? Are there any things I can check as troubleshooting, or is this normal? I've had some long DNS switches before but never this "back and forth" stuff...
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Feb 24, 2007
[url]
If you look at the image there are 14 connections from a blank ip what is that and how do i stop it?
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Oct 14, 2007
well i had an issue with not beable to access FTP. so i reboot server, but it took quiet abit longer to start then usual, so i emailed the D/C to reboot it, before they reboot it. it starts working fine, i can access it etc etc...
after i recieve an email from the tech saying he has rebooted it, i find that i am unable to access my own server http/ssh... i've checked the site via a proxy and it works..
check it your self [url] - does this work for you?
as it sure as hell doesnt work for me.... unsure what could have happned or anything.. tech guy doesnt seem to be helping me much at all.
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Jan 23, 2007
When I try to play one of my own camtasia videos in Firefox they just don't work! If I open them in an other browser they play just fine.
If I open the same video on a other server, it starts!
I see the playbar, the buttons, it says it's waiting for the server but they just don't start playing! How weird is that!
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Sep 18, 2009
a sales told me i can buy two switch and do series connection,
then if one fail,another will continue to work,
it will take high HA,
but i still can not understand how to do it and work,
could you know what it is?
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Nov 25, 2008
I see some errors about lame servers in messages log,and i noticed that look like adress of isp surfer domain beacuse i noticed domain of my isp listed also as lame name server.Here is example:
Nov 24 03:46:55 available9 named[7562]: lame server resolving '247.100.51.72.in-addr.arpa' (in '100.51.72.in-addr.arpa'?): 205.214.192.202#53
Nov 24 03:46:55 available9 named[7562]: lame server resolving '247.100.51.72.in-addr.arpa' (in '100.51.72.in-addr.arpa'?): 205.214.192.201#53
Nov 24 03:46:56 available9 named[7562]: lame server resolving '247.100.51.72.in-addr.arpa' (in '100.51.72.in-addr.arpa'?): 205.214.192.202#53
Nov 24 03:46:56 available9 named[7562]: lame server resolving '247.100.51.72.in-addr.arpa' (in '100.51.72.in-addr.arpa'?): 205.214.192.201#53
Nov 24 07:19:51 available9 named[7562]: FORMERR resolving 'ducksimilar.com/NS/IN': 203.93.208.87#53
Nov 24 07:19:51 available9 named[7562]: FORMERR resolving 'ducksimilar.com/NS/IN': 91.208.228.150#53
Nov 24 07:19:52 available9 named[7562]: FORMERR resolving 'host1.experienceexcept.com/AAAA/IN': 203.93.208.87#53
Nov 24 07:19:52 available9 named[7562]: FORMERR resolving 'host2.experienceexcept.com/AAAA/IN': 203.93.208.87#53
Nov 24 07:19:52 available9 named[7562]: FORMERR resolving 'host1.experienceexcept.com/AAAA/IN': 91.208.228.150#53
Nov 24 07:19:52 available9 named[7562]: FORMERR resolving 'host2.experienceexcept.com/AAAA/IN': 91.208.228.150#53
Nov 24 07:19:52 available9 named[7562]: FORMERR resolving 'host1.experienceexcept.com/AAAA/IN': 203.93.208.87#53
Nov 24 07:19:52 available9 named[7562]: FORMERR resolving 'host2.experienceexcept.com/AAAA/IN': 203.93.208.87#53
Nov 24 07:19:52 available9 named[7562]: FORMERR resolving 'host1.experienceexcept.com/AAAA/IN': 91.208.228.150#53
Nov 24 07:19:52 available9 named[7562]: FORMERR resolving 'host2.experienceexcept.com/AAAA/IN': 91.208.228.150#53
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Sep 24, 2008
My hosting company has been great. The server is in a secure place, but I can't help but wonder: what if a bomb hits there or something? What could I do? With all the websites I host, I would like to see what kind of backup plan there could be. Is there a way to have a server on the other side of the world automatically be switched to if it were to go down?
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Feb 18, 2008
I saw a one port KVM/IP switch, simply a little case that fits in your hand, with 2xPS/2 ports, a VGA and a network output (it didn't even require an extra power input, although that isn't a requirement). I remember it was about 55 euros (about 80USD).
Does anyone remember such a little small thing? I can't find that catalogue anymore..
If you find one with a USB port for virtual media (like 32MB..)
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May 5, 2008
I currently have a dedicated server with beachcomber.net and have had a great experience. But I found a promo from myinternetservices.com that may end up as close to 50% off my current price with similar specs. What experiences have people had with either company for dedicated servers? Mainly I'm asking about MyIS since I've already experienced Beachcomber. Does it compare? Which one is better, etc.?
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Jul 28, 2009
I have two quad core processors and load is like 15.
May it be caused by switch if it doesnt let traffic trough properly?
if dmesg grep eth shows 100 full duplex is it normal or should it be 1000 full duplex?
how can I make it 1000 full duplex on centos 5?
Quote:
0000:0a:02.0: eth0: (PCI Express:2.5GB/s:Width x4)
0000:0a:02.0: eth0: Intel(R) PRO/1000 Network Connection
0000:0a:02.0: eth0: MAC: 3, PHY: 5, PBA No: ffffff-0ff
0000:0a:02.0: eth1: (PCI Express:2.5GB/s:Width x4)
0000:0a:02.0: eth1: Intel(R) PRO/1000 Network Connection
0000:0a:02.0: eth1: MAC: 3, PHY: 5, PBA No: ffffff-0ff
ADDRCONF(NETDEV_UP): eth0: link is not ready
0000:0a:02.0: eth0: Link is Up 100 Mbps Full Duplex, Flow Control: RX/TX
0000:0a:02.0: eth0: 10/100 speed: disabling TSO
ADDRCONF(NETDEV_CHANGE): eth0: link becomes ready
ADDRCONF(NETDEV_UP): eth1: link is not ready
0000:0a:02.0: eth1: Link is Up 100 Mbps Full Duplex, Flow Control: RX/TX
0000:0a:02.0: eth1: 10/100 speed: disabling TSO
ADDRCONF(NETDEV_CHANGE): eth1: link becomes ready
eth0: no IPv6 routers present
eth1: no IPv6 routers present
ADDRCONF(NETDEV_UP): eth0: link is not ready
0000:0a:02.0: eth0: Link is Up 100 Mbps Full Duplex, Flow Control: RX/TX
0000:0a:02.0: eth0: 10/100 speed: disabling TSO
ADDRCONF(NETDEV_CHANGE): eth0: link becomes ready
ADDRCONF(NETDEV_UP): eth1: link is not ready
0000:0a:02.0: eth1: Link is Up 100 Mbps Full Duplex, Flow Control: RX/TX
0000:0a:02.0: eth1: 10/100 speed: disabling TSO
ADDRCONF(NETDEV_CHANGE): eth1: link becomes ready
eth0: no IPv6 routers present
eth1: no IPv6 routers present
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Jun 28, 2014
Just in the process of upgrading to new box Plesk 12 (Ubuntu 14.04LTS). ON the previous (plesk 10) I was able to disable ftp services by editing /etc/xinetd.d/ftp_psa - this doesn't seem to be an option now. How to do this on plesk 12?
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Oct 26, 2014
As the title says: How do I switch to NGINX only as my web server, while disabling/removing apache in Plesk?
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Jun 3, 2009
I've got a vB site which has a RSS Poster Bot (fetches RSS Feeds then posts them). However, for some strange reason, it stopped working. Theres no errors in the error_log and when I do a manual run, it just times out after a minute or so.
The only thing I can think of is that one of the RSS Feeds is down or one of the sites is blocking the server IP for some reason.
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Apr 28, 2008
i have this really annoying issue i'm hoping you can help with.
it seems the spamd child process gets stuck and causes 100% cpu usage. but this doens't just happen randomly, its only for this single user account. e.g. take a look at top output:
4581 <username> 93 40:58.87 1.3 82624 52m 2280 R spamd child
the 93 is 93% cpu usage. 40:58 is how long the process has been running, 40 minutes and counting (i just killed it though). and all it tells me its running spamd child. it usually dies after a few hours but only after causing 200% cpu usage (100% on both cpus) and making my server load skyrocket. This happens at least twice daily at no set times.
this user isn't a spammer. no scripts, no mail queue generation, no email accounts even.
running cpanel 11, centos 4.
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Oct 8, 2007
I have a weird problem since the movement of our ip range with one of our servers. Bind doesn`t seem to react on any changes we make.
For example, the server still resolves to the old ip adress while we changed all of those with ipswap.sh (directadmin)
The weird thing is that all zone files are 100% Correct. Ip`s are all changed and no sign of the old ip whatsoever.
Again, the nameserver still resolves to the old ip`s.
Also when i create a new domain, named.conf is changed and the zone file is created sucessfully. Still the nameserver doesn`t seem to add the domain name.
Restarting, reloading and even reinstalling named doesn`t help
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Mar 29, 2008
I'm seeing weird characters on my support home page:
That's found right below "Home > Support"
The source code shows the following...
Quote:
<tr>
<td style="padding:0px"><p>Welcome to our Support Area.</p>
I've checked the two template files (header.tpl and homepage.tpl) but did not find such characters. Its boggling me. Not even whitespace.
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Aug 4, 2007
Got a couple of questions on my Centos server.
It is my only (at present), and main production web server located in a datacentre in the Uk.
I am running Centos 4-4.2 since a hardware failure earlier this year neccesitated a stressful overnight ssh reinstall.
I have it setup pretty well now (I think!) but I cant work out how I am able to sftp into the server!
Reason being, I have installed VSFTPD (made sure there were no ftpd daemons installed or running), and when I stop this service via sshd, it does not affect the fact that I can then sftp in to the server using an ftp client such as wsftp pro...
Also, even when I change the vsftpd.conf to jail certain ftp users to a directory, it seems to have no effect and ftp works exactly as it did before without imposing the restrictions?
There is no other ftp daemon showing up in the process list.
I have tripwire installed, rootkit hunter, and cisco hardware firewall in conjunciton with ip tables.
I dont 'think' its hacked!
Also, the last time I upgraded centos was from an early v4 to 4.4.2 due to major hardware failure on the server and the fact I didnt have a mirrored OS/server backup (due to cost) *but I did of course have all my sites and databases etc)
I am rather scared to upgrade Centos kernel to the latest version in part due to horror stories I have heard from others (NOT regarding Centos specifically) from kernel upgrades going wrong or compatibility issues etc that mean that I am very very reluctant to do it on our main production server..
I am imminently buying another server to act as a failover and backup for the existing one,but is keeping my current Centos install as it is and holding out to wait for a test server the best thing to do? (are there any serious security issues in 4.4.2? bugs etc?)
Or should I have confidence and get Yum to do its business!
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Aug 9, 2007
This is a very weird network issue that we are currently facing.
There are 2 servers, 1.1.1.1 and 2.2.2.2;
I can ping both IPs from my computer at the office or from anywhere else.
BUT, I cannot ping each other. For example, I log into 1.1.1.1 and cannot ping 2.2.2.2 and vice-versa.
This is very weird and I am thinking this is not OS related and something beyond that.
I was wondering if anyone of you came across this type of issue and possible direct us in the right direction.
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Dec 25, 2007
It seems that i am facing some weird Apache issue.
I cant access my forum.domain.com but can access forum.domain.com/admin
I didnt found anything in Apache error logs,but found this in access logs
IP HERE - - [26/Dec/2007:03:13:44 +0400] "GET / HTTP/1.0" 200 22435 "-" "Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 5.1; InfoPath.1; .NET CLR 2.0.50727)"
Is there anything strange in that info and what does 22435 represent?
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May 6, 2009
On one of my Web sites I have it set to e-mail me whenever someone tries a SQL Injection attempt through the GET.
(I find some of the results interesting and/or funny.)
I also have it e-mail me the visitor's IP address and browser client.
I recently got one with a result for the IP address that certainly got my interest.
It read:
Quote:
<?php phpinfo(); echo "LOOOOL, X-FORWERD BUG"; ?>
The PHP scripting I use to get the IP address is:
Code:
$visIP = isset($_SERVER['HTTP_X_FORWARDED_FOR']) ? $_SERVER['HTTP_X_FORWARDED_FOR'] : $_SERVER['REMOTE_ADDR'];
I guess I'm wondering how they may have done it, and if this indicates an issues where people can hack my site (for control or at least info) through this method?
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May 5, 2009
I keep getting weird characters such as .... in MySQL.
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Jun 17, 2009
We have a license application client(IBM/LUM) that connects to a license server outside our network.
The clients works this way... it binds a random port and tries to connect to the remote IP with UDP port 1515.
Through wireshark I could see that it reaches the destionation, although the way back is unreachable.
If I add this random port to our router Port Forward rule, it works perfectly. Although this is not a solution cause the port is changing every time.
Isnt this strange? Other applications open random ports as well and comunication is two-way reachable.
If I connect directly to the internet, it works perfectly as well.
What can I try to do with our ZyWall USG300 Router to fix this situation?
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Feb 19, 2008
I've a few similar video sites and haven't noticed much difference over the years with their stats. They usually average anywhere from 50-100mb downloaded per day.
Suddenly this month, one site is practically going off the scale...600-700mb...up to 1gb downloaded per day...I'm like...wtf?! The other site is reporting normal BW.
I'm using awstats with hotlink protection enabled.
Is something or someone draining my bandwidth?
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Feb 19, 2008
I have compiled a RT kernel using 2.6.24 and it has been working great. All of our machines are runnin Centos 5. No issues like the previous configurations on Dual Quad Xeons 5335's and 8GB of RAM. As well as one box with Dual Core Xeon 5140's with 4GB of RAM. They have identical motherboards. My issue is that when you do a soft reboot, it doesn't "technically" reboot. It does, but it doesn't. Let me explain. It kills my ssh connection and you can't ping it for maybe say a minute or 2. When it comes back up, you get a new SSH key to login. You hit ok, and you try logging in. It doesn't accept any passwords. The server basically becomes inoperable.
The only way to solve this is to do a hard reboot. Phsyically rebooting the server.
What could be causing this? This only started to happened when using the RT kernel. Is there an option that may be conflicting with it, however our 3rd and 4th box, with the same configuration has no issues like this. Soft reboots work great.
Here is the message log.
Feb 19 04:00:02 server530 shutdown[25342]: shutting down for system reboot
Feb 19 04:00:02 server530 init: Switching to runlevel: 6
Feb 19 04:00:03 server530 smartd[3037]: smartd received signal 15: Terminated
Feb 19 04:00:03 server530 smartd[3037]: smartd is exiting (exit status 0)
Feb 19 04:00:09 server530 ntpd[20917]: ntpd exiting on signal 15
Feb 19 04:00:09 server530 rpc.statd[2570]: Caught signal 15, un-registering and exiting.
Feb 19 04:00:09 server530 portmap[25711]: connect from 127.0.0.1 to unset(status): request from unprivileged port
Feb 19 04:00:10 server530 auditd[2469]: The audit daemon is exiting.
Feb 19 04:00:10 server530 kernel: audit(1203415210.158:8204): audit_pid=0 old=2469 by auid=4294967295
Feb 19 04:00:10 server530 pcscd: pcscdaemon.c:529ignal_trap() Preparing for suicide
Feb 19 04:00:10 server530 pcscd: hotplug_libusb.c:361:HPEstablishUSBNotifications() Hotplug stopped
Feb 19 04:00:11 server530 pcscd: readerfactory.c:1350:RFCleanupReaders() entering cleaning function
Feb 19 04:00:11 server530 pcscd: pcscdaemon.c:489:at_exit() cleaning /var/run
Feb 19 04:00:11 server530 kernel: Kernel logging (proc) stopped.
Feb 19 04:00:11 server530 kernel: Kernel log daemon terminating.
Feb 19 04:00:12 server530 exiting on signal 15
Oh and this is to reboot the server nightly at 4am, when this issue occurs.
0 4 * * * /usr/bin/reboot > /dev/null 2>&1
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Feb 9, 2008
if you type in the browser
Code:
neomagician.com
it redirects to
Code:
[url]
ok no problem there. but when you type
Code:
neomagician.com/forum
OR
[url]
it redirects to the hostname
Code:
[url]
where you promptly receive a 404 error.
BUT, if you type
Code:
[url]
(note the forward slash on the end)
it works just fine.
If you type a nonexistent file or folder it only 404s on the domain name and no redirection occurs.
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May 6, 2008
I have a client who was sending email to another server with Cpanel, all of a sudden all emails are in the queue for a few days and we checked everything was ok on our side even the logs are able to find the domain name, just that it drops from there.
Took me a while I finally telnet their port 25 and found it block, but somehow a few minutes later it was unblocked. Is there any mechanism in Cpanel that auto block port 25? I know the client uses a catchall so all rubbish went there, I cleared the catchall for him.
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Dec 6, 2008
I added a USB nic to my main server which also acts as VM server so I can bridge some VMs on a separate network then that actual server, for security purposes. This nic has no IP and is connected to another router. My private LAN router (router1) is connected to that router. (router2)
In vmware server I made a new bridged network to eth1 which is the USB nic.
now for whatever reason, there does not seem to be communication on that new nic. if I set a static IP on a VM sometimes I can ping the gateway, sometimes not. It's on and off. Also, DHCP won't work at all, but I know DHCP works on that network as if I plug a PC into that router I get an IP right away.
that this is a home setup, not an internet setup, so I have full physical access.
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May 2, 2007
I'm using CP+ panel.
Here's the weird thing, when I look inside my domain name and to the A record to add a subdomain, it shows me another domain name (which is also mine). When I add a subdomain to that anyway, I get a subdomain.realdomain.anotherdomain.com entry instead of subdomain.realdomain.com Also in the list some domains are correct while most of them are pointing to each others.
I've checked the named conf and also apache conf and I don't see anything wrong at all. They're all linked to their correct location. Anyone here have any inklings on what it might be? Never seen anything like it before.
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Jul 9, 2007
For the last week, my vps (directadmin on centos on xen) has become unresponsive every three days at approximately 5 AM, and I'm baffled about why. It doesn't crash, but it stops accepting incoming connections until it's rebooted.
I'm not sure how to troubleshoot this. /var/log/messages gives no useful information. There are no unusual cronjobs running at that time.
Anyone heard of anything like this before or have any advice about how to troubleshoot?
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May 9, 2007
I just installed the latest PHP 5.5.2 on Windows 2003 IIS 6. The Web extension for php in cgi mode is automatically allowed, but all php scripts shows file not found, only when I enabled allowed all cgi extensions, does the php pages showed up ok.
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Jul 8, 2007
Has anyone else noticed some weird Savvis routing in the NY/NJ area since their maintenance on Friday night?
I'm in NY and a trace to the NJ1 datacenter in Jersey City NJ shows:
Code:
1 <1 ms <1 ms <1 ms 10.0.0.3
2 24 ms 23 ms 23 ms 10.32.37.1
3 26 ms 24 ms 23 ms at-3-1-1-1732.CORE-RTR1.NY325.verizon-gni.net [1
30.81.11.173]
4 24 ms 24 ms 24 ms 130.81.20.176
5 * 30 ms 30 ms 0.so-3-1-0.XT1.NYC9.ALTER.NET [152.63.10.37]
6 32 ms 75 ms 34 ms 0.so-4-2-0.XL3.NYC4.ALTER.NET [152.63.0.213]
7 32 ms 32 ms 32 ms 0.so-6-2-0.BR1.NYC4.ALTER.NET [152.63.3.149]
8 32 ms 32 ms 32 ms bcs1-so-5-1-0.NewYork.savvis.net [204.70.1.5]
9 34 ms 32 ms 32 ms cr1-pos-0-0-5-2.Washington.savvis.net [204.70.195.1]
10 32 ms 32 ms 32 ms 204.70.197.5
11 33 ms 33 ms 33 ms 204.70.197.14
12 33 ms 32 ms 32 ms hr2-tenge-13-2.Weehawkennj2.savvis.net [216.35.78.6]
13 32 ms 33 ms 32 ms 204.70.196.74
14 33 ms 33 ms 33 ms 204.70.196.78
15 32 ms 32 ms 32 ms bhr2-ge-5-0.JerseyCitynj1.savvis.net [204.70.196.86]
16 33 ms 32 ms 32 ms csr22-ve241.Jerseycitynj1.savvis.net [216.32.223.51]
Why are the packets going from NewYork to Washington to Weehawken and then to Jersey City? Also, what are those 4 unnamed nodes at 10,11, 13 and 14?
I'm also getting 200ms+ ping times and 13% loss to/from our offsite VPSs
Code:
640 packets transmitted, 554 received, 13% packet loss, time 639988ms
rtt min/avg/max/mdev = 192.275/198.945/227.685/3.173 ms, pipe 2
[root@offsite ~]# traceroute 216.32.223.51
1 eqash79.keepitsecure.net (69.65.111.117) 0.173 ms 0.125 ms 0.063 ms
2 r02.iad.defenderhosting.com (69.65.112.2) 3.440 ms 0.345 ms 0.290 ms
3 ge2-10.as.eqxashva.aleron.net (205.198.14.245) 0.473 ms 0.554 ms 0.482 ms
4 ber1-ge-8-10.virginiaequinix.savvis.net (208.173.52.105) 0.591 ms 0.567 ms 0.438 ms
5 cpr2-ge-5-0.virginiaequinix.savvis.net (204.70.193.101) 0.588 ms 0.606 ms *
6 bcs2-so-2-0-0.washington.savvis.net (204.70.193.153) 119.863 ms 3.639 ms 3.378 ms
7 cr1-tengig-0-7-0-0.Washington.savvis.net (204.70.196.105) 198.659 ms 201.783 ms *
8 bcs2-so-2-0-0.NewYork.savvis.net (204.70.192.2) 202.751 ms 195.501 ms *
9 * dcr3-ge-0-2-1.newyork.savvis.net (204.70.193.98) 201.978 ms 198.180 ms
10 204.70.197.5 (204.70.197.5) 7.627 ms 6.984 ms 6.196 ms
11 204.70.197.14 (204.70.197.14) 6.822 ms 6.534 ms 6.460 ms
MPLS Label=1640 CoS=5 TTL=1 S=0
12 hr2-tenge-13-2.Weehawkennj2.savvis.net (216.35.78.6) 6.752 ms 6.634 ms 6.509 ms
MPLS Label=66 CoS=5 TTL=1 S=0
13 204.70.196.74 (204.70.196.74) 7.550 ms 6.600 ms 6.479 ms
MPLS Label=339 CoS=5 TTL=1 S=0
14 204.70.196.78 (204.70.196.78) 6.607 ms 6.633 ms 6.482 ms
MPLS Label=339 CoS=5 TTL=1 S=0
15 bhr2-ge-5-0.JerseyCitynj1.savvis.net (204.70.196.86) 198.841 ms * 201.303 ms
16 csr22-ve241.Jerseycitynj1.savvis.net (216.32.223.51) 196.147 ms * 199.857 ms
The second trace shows that there is a path between New York and Weehawken without going through Washington, even though the first route went through Washington between NY and NJ. The only reason that I can think of is that someone in Washington wants to see the traffic (wink wink)?
I've contacted Savvis, but got the stock response "Savvis’ backbone routers forward traffic through the optimal logical path within our network. Although the physical path may seem odd occasionally, it is actually the optimal path."
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